检索Access数据库中的索引列表 [英] Retrieve list of indexes in an Access database

问题描述

我知道有一种方法可以通过使用MsysObjects查询Access数据库中的所有表的列表：

I know there's a way to get a list of all tables in an Access database by using the quering the MsysObjects:

SELECT MSysObjects.Name FROM MsysObjects
WHERE
  Left$([Name],1)<>'~' AND
  Left$([Name],4)<>'Msys' AND
  MSysObjects.Type=1

有人知道类似可以检查 TableDef中的所有索引的列表？

Does anybody know a similar (or other) way to retrieve a list of all indexes in an MS-Access database?

推荐答案

对象访问索引名称。

You can examine TableDef objects to access the index names.

Public Sub ShowIndexNames()
    Dim tdf As TableDef
    Dim idx As Index
    Dim num_indexes As Long

On Error GoTo ErrorHandler

    For Each tdf In CurrentDb.TableDefs
        num_indexes = tdf.Indexes.Count
        If Left$(tdf.Name, 4) <> "MSys" Then
            If num_indexes > 0 Then
                For Each idx In tdf.Indexes
                    Debug.Print tdf.Name, idx.Name
                Next idx
            End If
         End If
    Next tdf

ExitHere:
    Exit Sub

ErrorHandler:
    Select Case Err.Number
    Case 3110
        'Could not read definitions; no read definitions '
        'permission for table or query '<Name>'. '
        Debug.Print "No read definitions permission for " _
            & tdf.Name
        num_indexes = 0
        Resume Next
    Case Else
        Debug.Print Err.Number & "-> " & Err.Description
        GoTo ExitHere
    End Select
End Sub

修改：修改子以忽略MSys *（访问系统）表。

Edit: Revised the sub to ignore MSys* (Access system) tables.

您还可以使用ADO的 OpenSchema 方法来检索索引的相关信息。下面的代码列出了索引名称，关联表以及索引是否是主键。我写了它为ADO使用晚期绑定，因为不需要为Microsoft ActiveX数据对象[版本]库设置引用。

You could also use ADO's OpenSchema method to retrieve information about indexes. The code below lists the index name, associated table, and whether the index is the primary key. I wrote it to use late binding for ADO because that doesn't require setting the reference for Microsoft ActiveX Data Objects [version] Library.

Const adSchemaIndexes As Long = 12
Dim cn As Object ' ADODB.Connection
Dim rs As Object ' ADODB.Recordset
Dim i As Long

Set cn = CurrentProject.Connection
Set rs = cn.OpenSchema(adSchemaIndexes)
With rs
    ' enable next three lines to view all the recordset column names
'    For i = 0 To (.Fields.Count - 1)
'        Debug.Print .Fields(i).Name
'    Next i
    Do While Not .EOF
       Debug.Print !TABLE_NAME, !INDEX_NAME, !PRIMARY_KEY
       .MoveNext
    Loop
    .Close
End With
Set rs = Nothing
Set cn = Nothing

如果您喜欢检查单个表的索引，而不是数据库中的每个表，请将表名作为数组的第五个元素。

If you prefer to examine indexes for a single table rather than for every table in the db, pass the table name as the fifth element of an array.

Set rs = cn.OpenSchema(adSchemaIndexes, Array(Empty, Empty, Empty, Empty, "tblFoo"))

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